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We present the prototype of a time-to-digital (TDC) ASIC for the upgrade ofthe ATLAS Monitored Drift Tube (MDT) detector for high-luminosity LHCoperation. This ASIC is based on a previously submitted demonstrator ASICdesigned for timing performance evaluation, and includes all features necessaryfor the various operation modes, as well as the migration to the TSMC 130 nmCMOS technology. We present the TDC design with the emphasis on added featuresand performance optimization. Tests of the timing performance demonstrate thatthis ASIC meets the design specifications. The TDC has a bin size of about 780ps, and a timing bin variations within 40 ps for all 24 channels with leadingand trailing edge digitization, while the power consumption has been limited to250 mW, corresponding to a consumption of about 5.2 mW per edge measurement.

Design and performance of a TDC ASIC for the upgrade of the ATLAS Monitored Drift Tube detector